| Description | Date | Identifier | |
| Fitting an original EAC engine to a standard 40/50 HP chassis with front-wheel brakes. | 12th Jul 1923 | West Wittering \ K \ December1923 Scan71 | |
| The testing of 'HALO' brake material on a 20 HP car, comparing its friction and endurance against Ferodo. | 12th Dec 1923 | West Wittering \ K \ December1923 Scan72 | |
| Proposed modification to the E.A.C. switchbox to prevent headlights from being used without the charging switch engaged. | 20th Dec 1923 | West Wittering \ K \ December1923 Scan73 | |
| Test results for a 110° Camshaft on a 40/50 HP engine compared to other engines. | 21th Dec 1923 | West Wittering \ K \ December1923 Scan74 | |
| Comparing the 40/50 HP engine to the 20 HP engine using an indicator diagram. | 12th Jul 1923 | West Wittering \ K \ December1923 Scan75 | |
| Negative work caused by gas backflow into the induction pipe when the inlet valve opens at 2000 RPM. | 12th Jul 1923 | West Wittering \ K \ December1923 Scan76 | |
| Indicator diagrams showing engine pressure and performance metrics relative to crankshaft position. | 20th Dec 1923 | West Wittering \ K \ December1923 Scan77 | |
| Tests insulating the exhaust to reduce heat on the floorboards and under the scuttle for the 40/50 model. | 21th Dec 1923 | West Wittering \ K \ December1923 Scan78 | |
| Reducing heat on the floorboards and under the scuttle of a 40/50 HP car. | 11th Dec 1923 | West Wittering \ K \ December1923 Scan79 | |
| Modifications to reduce floor and scuttle temperature. | 12th Jul 1923 | West Wittering \ K \ December1923 Scan80 | |
| Modifying the 40/50 model's undershield for mud protection and testing cork covering for floorboards. | 12th Jul 1923 | West Wittering \ K \ December1923 Scan81 | |
| Tests with a double dash air insulated dashboard to address complaints of cold feet. | 11th Dec 1923 | West Wittering \ K \ December1923 Scan82 | |
| Temperature test results comparing different car modifications against a standard configuration to reduce heat in the cabin. | 11th Dec 1923 | West Wittering \ K \ December1923 Scan83 | |
| Graph showing the relationship between radiator water temperature and the air temperature at the rear of the engine fan under different conditions. | 17th Oct 1923 | West Wittering \ K \ December1923 Scan84 | |
| Two graphs showing the results of experiments to reduce floor-board temperature under various conditions. | 28th Dec 1923 | West Wittering \ K \ December1923 Scan85 | |
| Confirmation of a telegram requesting a 'Forty Fifty' car for photographic and testing purposes. | 2nd Jul 1923 | West Wittering \ K \ July1923 Scan0 | |
| Confirmation of a wire from Royce to Hives requesting a chassis for urgent testing. | 2nd Jul 1923 | West Wittering \ K \ July1923 Scan1 | |
| Decision to design a new bracket for the Goshawk standby magneto instead of altering crankcases. | 1st Jul 1923 | West Wittering \ K \ July1923 Scan2 | |
| Mr. Royce's idea for a vacuum reservoir and associated valves for the 40/50 model. | 7th Apr 1923 | West Wittering \ K \ July1923 Scan3 | |
| Issues with the 20HP dipping headlights, including lever fitment, spring load, and reflector rattle. | 4th Jul 1923 | West Wittering \ K \ July1923 Scan4 | |
| Specifications for two alternative springs for dipping headlamps and a parts request. | 5th Jul 1923 | West Wittering \ K \ July1923 Scan5 | |
| Modifications to the Goshawk 11 petrol tank filter and sump. | 5th Jul 1923 | West Wittering \ K \ July1923 Scan6 | |
| Fitting and dimensions of headlamps for a 20 HP chassis. | 5th Jul 1923 | West Wittering \ K \ July1923 Scan7 | |
| Implementation of side levers and seating accommodation for the Goshawk model. | 16th Jul 1923 | West Wittering \ K \ July1923 Scan8 | |
| Design progress and supply of drawings for the Goshawk side levers. | 7th Jul 1923 | West Wittering \ K \ July1923 Scan9 | |
| Modifications to the Goshawk engine's valve timing, including cam angles and clearances. | 6th Jul 1923 | West Wittering \ K \ July1923 Scan10 | |
| Alternative design for the Goshawk 11 steering pendulum lever ball end and requesting a trial piece. | 1st Jul 1923 | West Wittering \ K \ July1923 Scan11 | |
| Recommending the standardisation of a 17.5-inch celluloid covered steering wheel for the 40/50 model. | 6th Jul 1923 | West Wittering \ K \ July1923 Scan12 | |
| Proposals for routing the H.T. wire for the Goshawk 11 magneto ignition, including a sketch. | 7th Jul 1923 | West Wittering \ K \ July1923 Scan13 | |
| The Goshawk & 40/50 electrical systems, warning against running the dynamo without a battery and proposing a warning plate. | 10th Jul 1923 | West Wittering \ K \ July1923 Scan14 | |
| Requested modification for the Goshawk 11 Magneto Bracket. | 7th Jul 1923 | West Wittering \ K \ July1923 Scan15 | |
| Goshawk II engine timing, comparing standard and proposed cam settings with diagrams. | 12th Jul 1923 | West Wittering \ K \ July1923 Scan16 | |
| Note with a diagram discussing cam duration, lift, and angle between cams. | 12th Jul 1923 | West Wittering \ K \ July1923 Scan17 | |
| Mr. Royce's dissatisfaction with an oil level indicator for chassis 6.EX and proposing a new design. | 12th Jul 1923 | West Wittering \ K \ July1923 Scan18 | |
| Modifications to the Goshawk II engine timing and exhaust cam. | 1st Jul 1923 | West Wittering \ K \ July1923 Scan19 | |
| Issue with brakes being spoilt by over-oiling the back axle on a 20.HP car. | 16th Jul 1923 | West Wittering \ K \ July1923 Scan20 | |
| Carburetter restrictor issues in 20.HP demonstration cars, causing poor control at low and high speeds. | 13th Jul 1923 | West Wittering \ K \ July1923 Scan21 | |
| Impressions from a visit to test two Goshawk cars, discussing engine performance, potential modifications, and body characteristics. | 16th Jul 1923 | West Wittering \ K \ July1923 Scan22 | |
| Letter discussing the performance difference between two chassis, one rated at 22.HP and the other at 48.HP. | 16th Jul 1923 | West Wittering \ K \ July1923 Scan23 | |
| Recommending the replacement of Bendix starter pinions with Bijur ones on 20HP demonstration cars. | 16th Jul 1923 | West Wittering \ K \ July1923 Scan24 | |
| Modifications to the right-hand levers for the Goshawk 11 model. | 19th Jul 1923 | West Wittering \ K \ July1923 Scan25 | |
| Suggested modification for Goshawk 11 electrical system instructions regarding battery handling. | 19th Jul 1923 | West Wittering \ K \ July1923 Scan26 | |
| Development for the 40/50 oil level indicator assembly. | 19th Jul 1923 | West Wittering \ K \ July1923 Scan27 | |
| Goshawk engine timing, comparing the Goshawk I and Goshawk II models and recommending new camshafts. | 19th Jul 1923 | West Wittering \ K \ July1923 Scan28 | |
| Diagrams and notes on camshaft timing for GII engines. | 19th Jul 1923 | West Wittering \ K \ July1923 Scan29 | |
| Design of a 40/50 spare wheel carrier and requesting experimental sets be made. | 19th Jul 1923 | West Wittering \ K \ July1923 Scan30 | |
| Internal memorandum regarding a delayed chassis delivery (5.G.11) for a Goshawk 11. | 20th Jul 1923 | West Wittering \ K \ July1923 Scan31 | |
| Confirmation of a telegram requesting a decision on the preference for the fan drive. | 20th Jul 1923 | West Wittering \ K \ July1923 Scan32 | |
| Design and wiring of the Goshawk 11 standby magneto ignition system, comparing drawing LeC. 1744 with scheme No. 491. | 1st Jul 1923 | West Wittering \ K \ July1923 Scan33 | |
| Issues with the Goshawk 11 fan mounting, belt irregularity, and potential solutions. | 21th Jul 1923 | West Wittering \ K \ July1923 Scan34 | |
| The urgent fitting of Lucas RB.65 headlamps to a 20 HP Goshawk chassis. | 21th Jul 1923 | West Wittering \ K \ July1923 Scan35 | |
| Twofold modifications to the Goshawk 11 battery ignition condenser, referencing drawing No. LeC. 1745. | 1st Jul 1923 | West Wittering \ K \ July1923 Scan36 | |
| Failures and improvements for Goshawk electrical units. | 1st Jul 1923 | West Wittering \ K \ July1923 Scan37 | |
| With diagrams proposing the use of friction dampers to reduce torque reaction vibration in the 40/50 and Goshawk models. | 26th Jul 1923 | West Wittering \ K \ July1923 Scan38 | |
| 40/50 Oil Level Indicator and its associated drawing. | 27th Jul 1923 | West Wittering \ K \ July1923 Scan39 | |
| Investigation of a sticking Goshawk 11 starting switch at the request of Mr. Royce. | 7th Jul 1923 | West Wittering \ K \ July1923 Scan40 | |
| Investigation into a sticking Goshawk 11 starting switch. | 1st Jul 1923 | West Wittering \ K \ July1923 Scan41 | |
| Unavailability of a 40/50 HP car for photography, detailing issues with gearbox silence tests on the 6-EX car. | 1st Jul 1923 | West Wittering \ K \ July1923 Scan42 | |
| Potential application of an oil level indicator from the E.A.C. to the standard 40/50 model. | 7th Jul 1923 | West Wittering \ K \ July1923 Scan43 | |
| Endurance tests on contact breaker rubbing blocks comparing wear on bakelite and grey fibre. | 9th Jul 1923 | West Wittering \ K \ July1923 Scan44 | |
| Comparison of wear between continental bakelite and grey fibre in unlubricated conditions. | 9th Jul 1923 | West Wittering \ K \ July1923 Scan45 | |
| Endurance test report for a lubricated grey fibre rubbing block. | 27th Apr 1923 | West Wittering \ K \ July1923 Scan46 | |
| Continuation page of a report on tests of lubricated and unlubricated grey fibre and bakelite blocks. | 6th Jul 1923 | West Wittering \ K \ July1923 Scan47 | |
| The endurance test of a lubricated Continental Bakelite rubbing block. | 6th Jul 1923 | West Wittering \ K \ July1923 Scan48 | |
| Differences in the 20 HP electrical system and proposing a warning system for the battery. | 12th Jul 1923 | West Wittering \ K \ July1923 Scan49 | |
| Automatic charging systems, earthing suggestions, and a burnt-out distribution box. | 12th Jul 1923 | West Wittering \ K \ July1923 Scan50 | |
| Capacity-temperature tests performed on a 20 HP Goshawk ignition paper condenser. | 13th Jul 1923 | West Wittering \ K \ July1923 Scan51 | |
| Continued explanation of test results for condensers, detailing the effects of temperature on capacity and leakage. | 13th Jul 1933 | West Wittering \ K \ July1923 Scan52 | |
| Results of temperature and capacity tests on condensers. | 13th Jul 1923 | West Wittering \ K \ July1923 Scan53 | |
| Instructions for a temperature test on paper condensers. | 7th Jul 1923 | West Wittering \ K \ July1923 Scan54 | |
| Instruction sheet detailing a temperature testing procedure for various condensers. | 6th Nov 1918 | West Wittering \ K \ July1923 Scan55 | |
| Instructions detailing the results of condenser testing, noting permanent capacity increases after heating. | 6th Nov 1918 | West Wittering \ K \ July1923 Scan56 | |
| Instruction sheet discussing the relationship between condenser capacity, temperature, and leakage. | 6th Nov 1918 | West Wittering \ K \ July1923 Scan57 | |
| Graph showing the variation of capacity with temperature for different types of paper condensers. | 19th Jul 1923 | West Wittering \ K \ July1923 Scan58 | |
| Graph showing the variation of capacity with temperature for Goshawk paper condensers. | 18th Jul 1923 | West Wittering \ K \ July1923 Scan59 | |
| Graph showing the variation of capacity with temperature for Goshawk paper condensers, Group B. | 12th Feb 1923 | West Wittering \ K \ July1923 Scan60 | |
| Fitting difficulties and proposing solutions for the magneto ignition on a 20 HP car. | 3rd Jul 1923 | West Wittering \ K \ July1923 Scan61 | |
| Design improvement for the magneto connection and bracket. | 14th Jul 1923 | West Wittering \ K \ July1923 Scan62 | |
| The application of an E.A.C. Oil Level Indicator to the 40/50 HP model. | 14th Jul 1923 | West Wittering \ K \ July1923 Scan63 | |
| Comparing Goshawk engine valve timings with different camshafts. | 1st Jul 1923 | West Wittering \ K \ July1923 Scan64 | |
| Performance comparison graph of B.HP vs R.P.M. for the Goshawk II engine, detailing standard and experimental camshafts. | 21th Aug 1923 | West Wittering \ K \ July1923 Scan65 | |
| Performance comparison graph for an Engine 8 Goshawk II using standard and large diameter valves. | 21th Aug 1923 | West Wittering \ K \ July1923 Scan66 | |
| Analysis and testing of dynamo brush spring pressures for a 20 HP engine. | 17th Jul 1930 | West Wittering \ K \ July1923 Scan67 | |
| Results and future plans for intermittent and continuous running tests on electrical components. | 17th Jul 1933 | West Wittering \ K \ July1923 Scan68 | |
| Standardisation of a carburetter control modification. | 25th Jul 1923 | West Wittering \ K \ July1923 Scan69 | |
| Cover note for a report on the cooling of a 20 HP car, mentioning a previously left blue-print. | 27th Jul 1923 | West Wittering \ K \ July1923 Scan70 | |
| Radiator tests conducted on a 20-HP car. | 12th Jul 1923 | West Wittering \ K \ July1923 Scan71 | |
| Series of five graphs showing the results of cooling tests on a 20 HP engine. | 21th Jul 1923 | West Wittering \ K \ July1923 Scan72 | |
| The design of a Beatonson All-Weather body for chassis 5.G.11 with coachbuilders Messrs G. Beaton & Son Ltd. and Messrs Young of Bromley. | 1st Jun 1923 | West Wittering \ K \ June1923 Scan0 | |
| Revised design for a Goshawk 11 spring drive, referencing drawing Lec.1727. | 2nd Jun 1923 | West Wittering \ K \ June1923 Scan1 | |
| Page detailing alterations to the outer drive unit, damper springs, and spanner for reassembly, linking to the standardization of the cooling fan drive. | 27th Sep 1932 | West Wittering \ K \ June1923 Scan2 | |
| Performance calculations and proposed modifications for the 40/50 starter motor. | 4th Jun 1923 | West Wittering \ K \ June1923 Scan3 | |
| The design of a teaser circuit and windings for the 40/50 RR dynamo and starter motor. | 9th Jun 1923 | West Wittering \ K \ June1923 Scan4 | |
| From E. to H.S. requesting a further vibration test on the Goshawk 11 crankcase, as instructed by Mr. Royce. | 1st Jun 1923 | West Wittering \ K \ June1923 Scan5 | |
| Request for information on the wear and cleanliness of ball joints on temporary Goshawk II radius rods. | 1st Jun 1923 | West Wittering \ K \ June1923 Scan6 | |
| Inspection memo on sample spanners, noting they are too thick and requesting they be reduced to the correct size. | 12th Jun 1923 | West Wittering \ K \ June1923 Scan7 | |
| New shortened 'D' type instrument board bracket and its attachment. | 12th Jun 1923 | West Wittering \ K \ June1923 Scan8 | |
| Secret memo regarding the design of new type brush holders for the Goshawk engine. | 14th Jun 1923 | West Wittering \ K \ June1923 Scan9 | |
| Query regarding the space allocated for the main field and teazer windings on a starter motor. | 15th Jun 1923 | West Wittering \ K \ June1923 Scan10 | |
| Load, wear, and potential improvements of Goshawk dynamo brush springs. | 19th Jun 1923 | West Wittering \ K \ June1923 Scan11 | |
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